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Old 02-27-2016, 10:17 PM   #7 (permalink)
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Originally Posted by NCchevy View Post
And I'm curious but being that my truck has the electric lift pump shouldn't it pump fuel out of the air and water drain valve with the key on engine off?
In a word, no. This feature did not come in until the 1996+ 6.5L models

Originally Posted by NCchevy View Post
And does the pump make any audible sound with the on?
Mine makes a slight chatter sound.

BTW, if you hear it running after the engine is shut off, then it is definitely powered via the OPS I mentioned earlier and will run until oil pressure is below 4lbs of pressure (give or take)
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